mirror of
https://github.com/espressif/binutils-gdb.git
synced 2025-06-26 13:56:22 +08:00
8b89a20adb
This patch fixes a cleanup leak in macho_symfile_read (symbol_table):
symbol_table = (asymbol **) xmalloc (storage_needed);
make_cleanup (xfree, symbol_table);
Unfortunately, fixing the leak alone triggers a crash which occurs
while loading the symbols from an executable:
% gdb
(gdb) file g_exe
[SIGSEGV]
The crash is caused by the fact that performing the cleanup
right after the call to macho_symtab_read, as currently done,
is too early.
Indeed, references to this symbol_table get saved in the oso_vector
global during the call to macho_symtab_read via calls to
macho_register_oso, and those references then get accessed
later on, when processing all the OSOs that got pushed (see
call to macho_symfile_read_all_oso).
This patch prevents this by using one single cleanup queue for
the entire function, rather than having additional separate
cleanup queues (Eg: for the handling of the minimal symbols),
thus preventing the premature free'ing of the minimal_symbols
array.
Secondly, this patch takes this opportunity for avoiding the use
of the oso_vector global, thus making it simpler to track its
lifetime.
gdb/ChangeLog:
* machoread.c (oso_vector): Delete this global.
(macho_register_oso): Add new parameter "oso_vector_ptr".
Use it instead of the "oso_vector" global.
(macho_symtab_read, macho_symfile_read_all_oso): Likewise.
(macho_symfile_read): Use a local oso_vector, to be free'ed
at the end of this function, in place of the old "oso_vector"
global. Update various function calls accordingly. Use one
single cleanup chain for the entire function.
README for GNU development tools This directory contains various GNU compilers, assemblers, linkers, debuggers, etc., plus their support routines, definitions, and documentation. If you are receiving this as part of a GDB release, see the file gdb/README. If with a binutils release, see binutils/README; if with a libg++ release, see libg++/README, etc. That'll give you info about this package -- supported targets, how to use it, how to report bugs, etc. It is now possible to automatically configure and build a variety of tools with one command. To build all of the tools contained herein, run the ``configure'' script here, e.g.: ./configure make To install them (by default in /usr/local/bin, /usr/local/lib, etc), then do: make install (If the configure script can't determine your type of computer, give it the name as an argument, for instance ``./configure sun4''. You can use the script ``config.sub'' to test whether a name is recognized; if it is, config.sub translates it to a triplet specifying CPU, vendor, and OS.) If you have more than one compiler on your system, it is often best to explicitly set CC in the environment before running configure, and to also set CC when running make. For example (assuming sh/bash/ksh): CC=gcc ./configure make A similar example using csh: setenv CC gcc ./configure make Much of the code and documentation enclosed is copyright by the Free Software Foundation, Inc. See the file COPYING or COPYING.LIB in the various directories, for a description of the GNU General Public License terms under which you can copy the files. REPORTING BUGS: Again, see gdb/README, binutils/README, etc., for info on where and how to report problems.